<?php
class Application_Model_Pais extends Zend_Db_Table
{
    protected $_name    = 'tb_pais';
    protected $_primary = array('id_pais');

    public function getPaises()
    {
        $select = $this->select();
        $rowSet = $this->fetchAll($select);

        $paises = array('' => 'Selecione');
        if ($rowSet) {
            foreach($rowSet as $pais) {
                $paises[$pais->id_pais] = $pais->ds_pais;
            }
        }

        return $paises;
    }
}